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Hi p3rty8, "Amp Grd" protect in other brand is an error code for short and overload. Once the power applied to the unit and shorts sensed by the processor the unit will automatically turned to "Amp Grd" to avoid further damaged to other parts. Most shorts is in the supply voltage (B+, Vcc) line and most common caused is the sound output IC (mounted in heat sink). This part is responsible for amplifying the audio from the pre-amplifier stage and will feed to your speakers. If you have a knowledge in disoldering and soldering technique, I would advice you to pull-out this part and then try the unit. If the "Amp Grd" error code is gone then you must replaced this IC with a new one to back your unit in normal operation again.
Hope I helped you. Have a nice day! Thanks for using Fixya.
At this stage of the game(25 yr old car) make your own. Run 2 wires from battery (B+ and GRD) to radio. Make sure you put a fuse in the B+ circuit according to Radio's spec's. Install antenna wire in radio and if you don't know what color speaker wires are remove a speaker look at its wiring and locate them under the dashboard. If can't locate them buy some and install them. You need a B+ and Grd wire for each speaker from speaker to radio.
ok on most amps there are two sets of wire ports one for
speakers & one for +12v,grd & 12v remote start if you look over each port it will say what port is for what wire if it is in a connector it gets slightly more complecated what you do is with a vm check from wire to chassis ground [like seat bolts] 12v with key off when you cet power isolate wire then turn key on till radio comes on then do the same test for 12v isolate that will be remote start then turn key off &check from the first wire to other wire for ground to find speaker wires connect a regular peace of wire to chassis grd & touch the wires you will here the speaker pop be sure not to hold the wire on long cause it will blow the speaker
The blue one is switched because it has no power till you turn the key on This setup is on a Gold wing motorcycle with a intercom it is an elaborate setup The yellow wire shows a momentary grd every time you test it then nothing, no grd , no power